And that "man" didn't do anything to help?
The only safe thing I could think about is the to teach potential rape victims some type of Martial Arts for self-defense. Kickboxing would be quite nice in such a case. To kick the evil-doer there where it hurts most...

Sydney Man Jailed For Filming Gang Rape Of Teenager
A man has been jailed for at least five years after filming the gang rape of a 16-year-old girl at a Sydney house party.